android应用程序中蓝牙是否关闭的通知

我目前正在开发一个android应用程序。。 每当蓝牙启动时，我必须通知用户 在应用程序运行时关闭设备的 当前正在运行。。 如何通知远程设备 关掉？

---

提前感谢

注册BroadcastReceiver并使用intent action

蓝牙适配器。action\u STATE\u已更改

，并将您的通知代码移动到onReceive方法。别忘了检查新状态是否已关闭

if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) {
    if(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1) 
        == BluetoothAdapter.STATE_OFF)
        // Bluetooth was disconnected
}

---

如果要检测用户何时断开蓝牙连接，然后检测用户何时断开蓝牙连接，则应执行以下步骤：

1）获取用户蓝牙适配器：

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();    

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();

        // It means the user has changed his bluetooth state.
        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {

            if (btAdapter.getState() == BluetoothAdapter.STATE_TURNING_OFF) {
                // The user bluetooth is turning off yet, but it is not disabled yet.
                return;
            }

            if (btAdapter.getState() == BluetoothAdapter.STATE_OFF) {
                // The user bluetooth is already disabled.
                return;
            }

        }
    }
};    

this.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));    

2）创建并配置接收器，代码如下：

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();    

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();

        // It means the user has changed his bluetooth state.
        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {

            if (btAdapter.getState() == BluetoothAdapter.STATE_TURNING_OFF) {
                // The user bluetooth is turning off yet, but it is not disabled yet.
                return;
            }

            if (btAdapter.getState() == BluetoothAdapter.STATE_OFF) {
                // The user bluetooth is already disabled.
                return;
            }

        }
    }
};    

this.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));    

3）将您的广播接收器注册到您的活动中：

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();    

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();

        // It means the user has changed his bluetooth state.
        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {

            if (btAdapter.getState() == BluetoothAdapter.STATE_TURNING_OFF) {
                // The user bluetooth is turning off yet, but it is not disabled yet.
                return;
            }

            if (btAdapter.getState() == BluetoothAdapter.STATE_OFF) {
                // The user bluetooth is already disabled.
                return;
            }

        }
    }
};    

this.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));    

---

由于这里没有PM系统，请停止在您编辑的帖子中添加噪音。你在帖子中添加了无用的粗体字，这不是一件好事。您的编辑是受欢迎的，只是没有这种无用和恼人的噪音。